#content{
    width: 300px;
    margin: 0;
    padding: 0;
    overflow: hidden;
    font-size: 12px;
    line-height: 25px;
    border: 2px solid rgb(74, 74, 212);
}
ul,li{
    margin: 0;
    padding: 0;
    list-style: none;
}
/* 父级元素相对定位 */
#content ul{
    position: relative;
}
.tipText,.tipBg{
    position: absolute;
    width: 300px;
    height: 25px;
    top: 191px;

}
.tipText{
    color: aliceblue;
    /* 设置层级 */
    /* z-index: 999; */
}
.tipBg{
    background: rgb(243, 224, 116);
    opacity: 0.4;
}